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AD9040A Datasheet PDF : 16 Pages
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AD9040A
DEFINITIONS OF SPECIFICATIONS
Maximum Conversion Rate
Analog Bandwidth
The encode rate at which parametric testing is performed.
The analog input frequency at which the spectral power of the
fundamental frequency (as determined by FFT analysis) is
reduced by 3 dB.
Output Propagation Delay
The delay between the 50% point of the falling edge of the encode
command and the 1 V/4 V points of output data.
Aperture Delay
The delay between the rising edge of the encode command and
the instant at which the analog input is sampled.
Overvoltage Recovery Time
The amount of time required for the converter to recover to
10-bit accuracy after an analog input signal 150% of full scale is
Aperture Uncertainty (Jitter)
reduced to the full-scale range of the converter.
The sample-to-sample variation in aperture delay.
Power Supply Rejection Ratio (PSRR)
Differential Gain
The ratio of a change in input offset voltage to a change in power
The percentage of amplitude change of a small high frequency
supply voltage.
OBSOLETE sine wave (3.58 MHz) superimposed on a low frequency signal
(15.734 kHz).
Differential Nonlinearity
The deviation of any code from an ideal 1 LSB step.
Differential Phase
The phase change of a small high frequency sine wave (3.58 MHz)
superimposed on a low frequency signal (15.734 kHz).
Harmonic Distortion
The rms value of the fundamental divided by the rms value of
the harmonic.
Integral Nonlinearity
The deviation of the transfer function from a reference line
measured in fractions of 1 LSB using a “best straight line”
determined by a least square curve fit.
Minimum Conversion Rate
The encode rate at which the SNR of the lowest analog signal
Signal-to-Noise Ratio (SNR)
The ratio of the rms signal amplitude to the rms value of noise,
which is defined as the sum of all other spectral components,
including harmonics but excluding dc, with an analog input
signal 1 dB below full scale.
Signal-to-Noise Ratio (Without Harmonics)
The ratio of the rms signal amplitude to the rms value of noise,
which is defined as the sum of all other spectral components,
excluding the first eight harmonics and dc, with an analog input
signal 1 dB below full scale.
Transient Response
The time required for the converter to achieve 10-bit accuracy
when a step function is applied to the analog input.
Two-Tone Intermodulation Distortion (IMD) Rejection
The ratio of the power of either of the two input signals to the
power of the strongest third order IMD signal.
frequency tested drops by no more than 3 dB below the guar-
anteed limit.
VCC
1k⍀
1k⍀
AIN
2k⍀
1mA
1mA
VSS
ANALOG INPUT
VCC
1k⍀
1k⍀
VREF
6.8k⍀
GND
RL
2.5k⍀
BPREF
VCC
VOUT
RL
GND
REFERENCE CIRCUIT
VSS
BAND GAP OUTPUT
Figure 2. Equivalent Circuits
VCC
D0-D9
GND
CMOS OUTPUT
–6–
REV. D
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